If you have been ill for 7 days or less you don’t need to see a Doctor. You can complete a Self Certification form yourself. However some employers insist on a Doctor’s note regardless. A Doctors note under these circumstances involves a charge.
Many employers have their own self-certification forms. If your employer doesn’t have its own form click here for the self-certification form. You do not need to see a Doctor.
For more information visit the Gov.UK website.